1. You mean change it so every time one of them posts, its in red or blue? Not possible2. Yes, Users & Groups // profiles // Add // Necessarily filled ? // yes3. By a post or by a widget? You can do it two ways 4. General // Messages & emails // Configuration // Allow Quick Reply 5. not possible6. What? Please explain more

No.3 - You can set up a widget via: Admin panel >> Modules > Forum Widget Management > Create new.No.4 - This MIGHT be possible, but Id assume it would only be possible on PHPBB2 or PunBB, as they have template editing => I've have to sus it out to confirm it, which I can actually do a little later tonight No.6 - No, unfortunately that is not possible unless you add soemthing as the "Default content" (which could just be a blank space), but if the user removes it, it's gone until you add the space back via their profile in the admin panel.